LED Dimmer

LED Dimmer




LEDs can be dimmed in two methods: analog dimming and pulse-width modulation dimming

1. Analog dimming changes LED light output by simply adjusting the DC current in the string. Despite its attractive simplicity in construction, analog dimming is inappropriate for many applications, because it loses dimming accuracy by >25 percent at only 10:1 brightness levels and skews the color of the LEDs.

2. Pulse-Width Modulation dimming (PWM dimming) achieves the same effect by varying the duty cycle of a constant current in the string to effectively change the average current in the string. PWM dimming can produce 3000:1 and higher dimming ratios (at 100Hz) without any significant loss of accuracy, and no change in LED color.


Pulse-width modulation
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脈衝寬度調變      clickhere_darkgreen30_transp


PWM Dimming (Pulse-Width Modulation dimming)
There are 2 main methods dimming the white and single colour 12V LED strip/bar:

1. Mains Voltage Dimming – Ideal for existing wiring installations that require a mains voltage (traditional) wall mounted dimmer switch. A “Dimmable Mains to 12V” LED Driver must be used.

2. 12V Dimming – Ideal for dimming small circuits of up to 10m of LED Strip/bar. A 12V dimmer control and a standard 12V LED Driver must be used simultaneously. It usually offers a better range of dimming compared with mains dimming.

The 12V LED Light dimmer can control the brightness of LED strip/bar light. Since all LED flex strips/bars are very bright, it may be necessary to dim the LEDs to achieve the desired result. The dimming range is 100% brightness to zero.


PWM dimmer circuit using 555 timer chip


555 timer IC   clickhere_orange30_transp

555 計時器   clickhere_darkgreen30_transp



How to install a dimmer to LED strip lighting – Installation


Remark: (by Administrator)
To dim RGB LED light (color LED) is not in the ambit of discussion in this website neither I have its installation.